Magnetostratigraphic reinvestigation of the Palaeocene/Eocene boundary interval in Hole 690B, Maud Rise, Antarctica
Hole 690B, drilled on Maud Rise near Antarctica, provides one of the most important Palaeocene/Eocene boundary interval sections. Magnetostratigraphy plays a key role in dating Palaeocene/Eocene boundary events, but there are two problems with the published scheme in Hole 690B. The first concerns ma...
Published in: | Geophysical Journal International |
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Format: | Article in Journal/Newspaper |
Language: | English |
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Blackwell Publishing Ltd. The Journal's web site is located at http://www.blackwellpublishing.com/journals/GJI
2000
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Online Access: | https://doi.org/10.1046/j.1365-246X.2000.00109.x http://library.hku.hk:4550/resserv?sid=HKU:IR&issn=0956-540X&volume=114&spage=639&epage=646&date=2000&atitle=Magnetostratigraphic+reinvestigation+of+the+Palaeocene/Eocene+boundary+interval+in+Hole+690B,+Maud+Rise,+Antarctica http://hdl.handle.net/10722/72904 |
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ftunivhongkonghu:oai:hub.hku.hk:10722/72904 2023-05-15T13:54:24+02:00 Magnetostratigraphic reinvestigation of the Palaeocene/Eocene boundary interval in Hole 690B, Maud Rise, Antarctica Ali, JR Kent, DV Hailwood, EA 2000 https://doi.org/10.1046/j.1365-246X.2000.00109.x http://library.hku.hk:4550/resserv?sid=HKU:IR&issn=0956-540X&volume=114&spage=639&epage=646&date=2000&atitle=Magnetostratigraphic+reinvestigation+of+the+Palaeocene/Eocene+boundary+interval+in+Hole+690B,+Maud+Rise,+Antarctica http://hdl.handle.net/10722/72904 eng eng Blackwell Publishing Ltd. The Journal's web site is located at http://www.blackwellpublishing.com/journals/GJI United Kingdom Geophysical Journal International http://www.scopus.com/mlt/select.url?eid=2-s2.0-0034033787&selection=ref&src=s&origin=recordpage Geophysical Journal International, 2000, v. 141 n. 3, p. 639-646 doi:10.1046/j.1365-246X.2000.00109.x 646 55606 WOS:000087554000009 0956-540X 3 http://library.hku.hk:4550/resserv?sid=HKU:IR&issn=0956-540X&volume=114&spage=639&epage=646&date=2000&atitle=Magnetostratigraphic+reinvestigation+of+the+Palaeocene/Eocene+boundary+interval+in+Hole+690B,+Maud+Rise,+Antarctica eid_2-s2.0-0034033787 639 http://hdl.handle.net/10722/72904 141 Geophysical Journal International. Copyright © Blackwell Publishing Ltd. Magnetostratigraphy Magnetization Ocean drilling program Marine sediments Article 2000 ftunivhongkonghu https://doi.org/10.1046/j.1365-246X.2000.00109.x 2023-01-14T15:14:55Z Hole 690B, drilled on Maud Rise near Antarctica, provides one of the most important Palaeocene/Eocene boundary interval sections. Magnetostratigraphy plays a key role in dating Palaeocene/Eocene boundary events, but there are two problems with the published scheme in Hole 690B. The first concerns major mismatches of several magnetozones and biozones in the succession. The second is an unexplained pervasive declination cluster, which should not be present in these azimuthally unoriented piston cores. To resolve these issues, a palaeomagnetic reinvestigation was carried out on 98 specimens from 12 cores through the upper Palaeocene-middle Eocene section in Hole 690B. The bulk of the samples carry an approximately uniformly directed magnetically hard component resulting in a declination cluster effectively identical to that of the earlier study. The spurious magnetization can be explained either as an 'inward-radial magnetization' or as a 'core-split overprint'. By estimating the extent of the overprint within each sample, it has been possible to construct a filtered magnetostratigraphy for the section. The result is that many of the magnetozone-biozone mismatches are eliminated, and the record of the 2.5 Myr Chron C24r, which brackets the various events associated with the Palaeocene/Eocene boundary, is considerably cleaner. It is not possible to define the upper and lower boundaries of this magnetochron, so we recommend that the dating of the events within this section be based on the biostratigraphy only. link_to_subscribed_fulltext Article in Journal/Newspaper Antarc* Antarctica University of Hong Kong: HKU Scholars Hub Maud Rise ENVELOPE(3.000,3.000,-66.000,-66.000) Geophysical Journal International 141 3 639 646 |
institution |
Open Polar |
collection |
University of Hong Kong: HKU Scholars Hub |
op_collection_id |
ftunivhongkonghu |
language |
English |
topic |
Magnetostratigraphy Magnetization Ocean drilling program Marine sediments |
spellingShingle |
Magnetostratigraphy Magnetization Ocean drilling program Marine sediments Ali, JR Kent, DV Hailwood, EA Magnetostratigraphic reinvestigation of the Palaeocene/Eocene boundary interval in Hole 690B, Maud Rise, Antarctica |
topic_facet |
Magnetostratigraphy Magnetization Ocean drilling program Marine sediments |
description |
Hole 690B, drilled on Maud Rise near Antarctica, provides one of the most important Palaeocene/Eocene boundary interval sections. Magnetostratigraphy plays a key role in dating Palaeocene/Eocene boundary events, but there are two problems with the published scheme in Hole 690B. The first concerns major mismatches of several magnetozones and biozones in the succession. The second is an unexplained pervasive declination cluster, which should not be present in these azimuthally unoriented piston cores. To resolve these issues, a palaeomagnetic reinvestigation was carried out on 98 specimens from 12 cores through the upper Palaeocene-middle Eocene section in Hole 690B. The bulk of the samples carry an approximately uniformly directed magnetically hard component resulting in a declination cluster effectively identical to that of the earlier study. The spurious magnetization can be explained either as an 'inward-radial magnetization' or as a 'core-split overprint'. By estimating the extent of the overprint within each sample, it has been possible to construct a filtered magnetostratigraphy for the section. The result is that many of the magnetozone-biozone mismatches are eliminated, and the record of the 2.5 Myr Chron C24r, which brackets the various events associated with the Palaeocene/Eocene boundary, is considerably cleaner. It is not possible to define the upper and lower boundaries of this magnetochron, so we recommend that the dating of the events within this section be based on the biostratigraphy only. link_to_subscribed_fulltext |
format |
Article in Journal/Newspaper |
author |
Ali, JR Kent, DV Hailwood, EA |
author_facet |
Ali, JR Kent, DV Hailwood, EA |
author_sort |
Ali, JR |
title |
Magnetostratigraphic reinvestigation of the Palaeocene/Eocene boundary interval in Hole 690B, Maud Rise, Antarctica |
title_short |
Magnetostratigraphic reinvestigation of the Palaeocene/Eocene boundary interval in Hole 690B, Maud Rise, Antarctica |
title_full |
Magnetostratigraphic reinvestigation of the Palaeocene/Eocene boundary interval in Hole 690B, Maud Rise, Antarctica |
title_fullStr |
Magnetostratigraphic reinvestigation of the Palaeocene/Eocene boundary interval in Hole 690B, Maud Rise, Antarctica |
title_full_unstemmed |
Magnetostratigraphic reinvestigation of the Palaeocene/Eocene boundary interval in Hole 690B, Maud Rise, Antarctica |
title_sort |
magnetostratigraphic reinvestigation of the palaeocene/eocene boundary interval in hole 690b, maud rise, antarctica |
publisher |
Blackwell Publishing Ltd. The Journal's web site is located at http://www.blackwellpublishing.com/journals/GJI |
publishDate |
2000 |
url |
https://doi.org/10.1046/j.1365-246X.2000.00109.x http://library.hku.hk:4550/resserv?sid=HKU:IR&issn=0956-540X&volume=114&spage=639&epage=646&date=2000&atitle=Magnetostratigraphic+reinvestigation+of+the+Palaeocene/Eocene+boundary+interval+in+Hole+690B,+Maud+Rise,+Antarctica http://hdl.handle.net/10722/72904 |
long_lat |
ENVELOPE(3.000,3.000,-66.000,-66.000) |
geographic |
Maud Rise |
geographic_facet |
Maud Rise |
genre |
Antarc* Antarctica |
genre_facet |
Antarc* Antarctica |
op_relation |
Geophysical Journal International http://www.scopus.com/mlt/select.url?eid=2-s2.0-0034033787&selection=ref&src=s&origin=recordpage Geophysical Journal International, 2000, v. 141 n. 3, p. 639-646 doi:10.1046/j.1365-246X.2000.00109.x 646 55606 WOS:000087554000009 0956-540X 3 http://library.hku.hk:4550/resserv?sid=HKU:IR&issn=0956-540X&volume=114&spage=639&epage=646&date=2000&atitle=Magnetostratigraphic+reinvestigation+of+the+Palaeocene/Eocene+boundary+interval+in+Hole+690B,+Maud+Rise,+Antarctica eid_2-s2.0-0034033787 639 http://hdl.handle.net/10722/72904 141 |
op_rights |
Geophysical Journal International. Copyright © Blackwell Publishing Ltd. |
op_doi |
https://doi.org/10.1046/j.1365-246X.2000.00109.x |
container_title |
Geophysical Journal International |
container_volume |
141 |
container_issue |
3 |
container_start_page |
639 |
op_container_end_page |
646 |
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1766260151587700736 |